<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      position: 0;
    }
    .loading-mask {
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #000;
    }
    .loading-text {
      color: #fff;
      font-size: 32px;
    }
    @keyframes upDown {
      0% {
        transform: translateY(0px);
      }
      20% {
        transform: translateY(-24px);
      }
      40%, 100% {
        transform: translateY(0px);
      }
    } 
    .loading-text span {
      display: inline-block;
      animation: upDown 1.5s ease-in-out infinite;
      animation-delay: calc(.1s*var(--i));
    }
  </style>
</head>
<body>

<div class="loading-mask">
  <div class="loading-text">
    <span style="--i:1">拼</span>
    <span style="--i:2">命</span>
    <span style="--i:3">加</span>
    <span style="--i:4">载</span>
    <span style="--i:5">中</span>
    <span style="--i:6">.</span>
    <span style="--i:7">.</span>
    <span style="--i:8">.</span>
  </div>
</div>
</body>
</html>